Missing append method

Author: theangryangel

pydifact/mapping.py

@@ -278,3 +278,9 @@ def __getitem__(self, key):
 
     def __setitem__(self, key, value):
         self.value[key] = value
+
+    def append(self, value: AbstractMappingComponent):
+        """
+        Append an item to the loop
+        """
+        self.value.append(value)